Blast Furnace No 3 in the former industrial site of the Parque Fundidora has been converted into Horno3, an exceptionally impressive high-tech, hands-on museum devoted to Mexico’s steel industry. No expense has been spared here, from the steaming rocks at the entrance to the metal open-air elevator that climbs to the summit for dramatic bird's-eye views of Monterrey (included in admission). The entire process of steel-making is explained (with some English translations) along with its vital relevance to Monterrey and Mexico.
Don’t miss the dramatic furnace show, beamed from the bulk of Horno3 itself, and ask about combo zip-lining-rappelling tour (adult/child M$440/270) from the top of the metal tower. Last tickets are sold one hour before closing. There's a good cafe-restaurant, El Lingote, here too. Had enough of museums but are hankering to see the views from the top? Tickets on the open-air elevator to the summit can be purchased separately (M$45), with rides continuing until 10pm.